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Meeting	MS&T24: Materials Science & Technology
Symposium	Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
Presentation Title	Quantitative Analysis of Ca and Y Segregation Behaviors in Magnesium Aluminate Spinel
Author(s)	Alexander Campos-Quiros, Animesh Kundu, Masashi Watanabe
On-Site Speaker (Planned)	Alexander Campos-Quiros
Abstract Scope	Grain boundary (GB) segregation of dopants plays a crucial role in determining mechanical properties in magnesium aluminate spinel, such as the fracture toughness. However, to understand the atomic-level mechanism that correlates the segregation behaviors with the microscale mechanical properties, the effect of doping on the concentration of host cations (Mg²⁺ and Al³⁺) in the GB vicinity requires more extensive investigation. For this reason, the segregation behaviors of Ca and Y dopants in spinel, as well as the non-stoichiometry of host cations in the GB vicinity, were quantitatively evaluated by X-ray energy dispersive spectrometry and electron energy-loss spectrometry spectrum imaging (EELS-SI). Concentration profiles extracted from EELS-SIs indicated that Ca²⁺ replaced Mg²⁺, while Y⁺³ substituted Al³⁺ at GBs. Additionally, microhardness, indentation fracture toughness measurements, and quantitative fracture behavior analysis were conducted to better understand the effect of the different segregation behaviors of Ca and Y on the mechanical properties of spinel.

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